The pop princess was performing her Vegas show Piece of Me when she was waving out perfect, pretty, precious waves to her many fans. But who knew that generous and darling move would soon bite her on her perky, bumpin' booty?!

And bite it did because as Brit-Brit waved, her vocals for Alien started up! But the mic was nowhere near her mouth!

Uh…well, she is Brit so maybe her vocals are so magical she doesn't even need a mic for them!!

Whatever, we all know we're seeing this lovely lady in Vegas because SHE'S BRITNEY SPEARS and nothing else matters!

But if you want to see what's in store for your future visit, ch-ch-check out the oopsies…AFTER THE JUMP!!

And in a new interview published on Thursday, the college student admitted that she received a ton of hateful messages -- including death and rape threats -- following the crybaby candidate's digital tantrum.

The now-19-year-old explained to The Washington Post that she couldn't have anticipated the kind of backlash she received, saying: